Indicator and signal for boilers



2 Sheets-Sheet 1.

(No Model.)

J. e. LOGAN.

INDICATOR AND SIGNAL yPOR BOILERS.

No. 244,216.7.. Patented July 12,1881.

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WITNESSES (No Model.) 2 Sheets-Sheet 2.

J. G. LOGAN. INDICATOR AND SIGNAL FOR BOILERS. No. 244,267. Patented July 12,1881.

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UNITED STATES PATENT OFFICE.

JOHN G. LOGAN, OF PITTSBURG, PENNSYLVANIA.

INDICATOR AND SIGNAL FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 244,267, dated July 12, 1881.

Application filed May 17, 1881.

To all whom it may concern Be it known that I, JOHN GEARY LOGAN, of Pittsburg, in the county of Allegheny, State of Pennsylvania, have invented a new and useful Improvement in Water-Indicators and Signals for Steam-Boilers, and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in water-indicators and signals for steam-boilers; audit consists of a oat combined with a shaft inclosed in a tube furnished with an attachmen t-screw, the inner end of said shaft having' a iioat connected thereto, and nearits outer end a valve and valve-seat fitted in the front vertical wall of the steam-chamber, and on its outer end an index-finger projecting from arms, the sweep of said index-finger being regulated through the medium of adjusting-screws, said steam-chamber communicating with another chamber, which communicates by means of a valve with a steam-whistle, said valve being held to its seat through the medium of a spring, the tension of which may be increased or diminished at will.

My invention also consists in combining with said water-indicator an electric alarm, all of which will hereinafter more fully appear.

To enable others skilled in the art with which my invention is most nearly connected to make and use it, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification, Figure 1 is a vertical and longitudinal section of a steam-boiler furnished with my improvement in water-indicator and signal. the same. Fig. 3 is a transverse section ofthe boiler at line 7 of Fig. 1. Figs. 4 and 5 are enlarged detail views.

Reference being had to the accompanying drawings, A represents a cylindrical tube furnished with-openings B for the inlet of steam.

O represents a steam-chamber having a valveseat, D, which steam-chamber communicates with another chamber, E, having a valveseat, F.

To the upper side of the chamber E is at- Fig. 2 is an end elevation of (No model.)

tached a pipe, G, communicating with a steamwhistle, PI.

In the bore of the tube A is placed a shaft, I, having an arm, A', attached to it at J, on the end of which is a doat, K. Near the other end of said shaft is a valve, It, fitted to the valveseat D, the function of which is for packing the opening through which the shaft J projects without undue frictional action upon said shaft.

On the front of the steam-chamber is a lift, L, through which the Valve M passes, the upper end of which is held iu position and guided through the medium of a support, N, attached to the pipe O, which communicates with the steam-whistle PI and chamber E. To this support is attached an indicator-disk, P. The valve M is furnished with screw-threads Q and a screw-nut, S, fitted thereto, arranged above the liftL and around the valve; and above the screw-nut S and between the support N is arranged the spiral sprin gT, the tension of which is adjusted through the medium ofthe screwnut S.

Below the guide or support L, through the valve M, may project a piu, U, determining the lift of the valve M.

On the outer end of the shaft I is an index n ger or pointer, V, having arms WV, the sweep of said index n ger or pointer being regulated through the medium of adjusting-screws X, against which the arms strike.

To one of the arms IV are attached wires a, communicating with a battery, b, for evolving electricity, and with an alarm-bell, c, such as is used for telephonie purposes, the construction and operation of which is well understood.

I do not wish to be understood that I confine myself to attaching the wires communicating with the battery and indicator to any one part of the battery, as they may be attached at different parts and in various ways and the same result obtained.

By the arrangement of the float K, arm A', and shaft I with relation to the arms W and lift L, in case the water should fall and the valve M adhere to its seat from any cause, the great leverage combined with the pressure of steam and the leverage obtained by the float K, arm A', shaft I, and arm W, which forms a compound leverage acting upon the lift L, will IOO i? aeree@ raise the valve M from its seat, thus securing a positive action of the indicator and signal.

rIhe operation of my improvement is as follows: Steam entering the tube A, and the water falling;` below the desired and determined line, will cause one of the arms W to come in contact with one of the adjustingscrews X which will raise the lift L, which will lift the valve M and allow the steam to pass through chambers E and pipe G to the steam-whistle H, and thereby give notice that the water in the boiler has fallen below the determined line, and the arm W, to which the wires connected with the battery and electric alarm are connected, coming,` in contact with the screw X, will thereby `give an alarm by the bell giving` notice of low water in the boiler.

Having,` thus described my improvement, what I claim as of my invention isl. In a water-indicator, the combination 0i' the valve M, shaft I, tube A, iioat K, lift L, and arms W, one of said arms bein g connected to a wire insulated for an electric signal, all arran ged and operating` substantially'as herein described, and for the purpose set forth.

2. In a water-indicator, the valve M, in combination with the lift L, shaft I, tube A, and lioat K, all arranged substantially as herein described, and for the purpose set forth.

3. In a water-indicator, the combination of the valve M, shaft I, tube A, lift L, iioat K, and indexfnger, all arranged substantially as herein described, and for the purpose set forth.

4. In a water-indicator, the combination of the valve M, shaft I, tube A, iioat K, and index-ringer having` arms I/V, and lift L, having,` adjusting-screws X, all arranged substantially as herein described, and for the purpose set forth,

JOHN GEARY LOGAN.

Witnesses A. C. J oHNsToN, JAMES J. JonNsToN. G 

